Many massively multiplayer games start you out in a high-fantasy world as some kind of penniless elf who must go out and beat on goblin after goblin after goblin in the hopes of finally earning enough copper coins to buy a rusty dagger. From there, you work your way up to a less-rusty dagger, then maybe a sword, all while gaining experience levels, going on quests, and possibly adventuring with other players in a persistent world. Aion: Tower of Eternity will go a decidedly different route.
Yes, the game will have elements of high fantasy, but it will take place on a completely different planet inhabited by two factions of exotic-looking humanoids that carry bows, arrows, swords, shields, and magic spells, but can also sprout wings and fly through the air at will, or at least until your character tires and must rest briefly. Apparently, the world has been shattered into two parts and is separated by a monster-ridden rift--each half of the world is inhabited by one of these two factions, and it'll be your job to conquer the other half for your nation.